Hi, When below request gets implemented (in 4.8 firmware I'm told) you'll be able to do what you want in seconds with easy GUI mouse clicks:
For example in below mock up image LAN 4 (and Wifi) are not assigned to a VPN connection so would get direct local internet access without using VPN:
I'm really excited for when this arrives but sadly it's not available yet, no 4.8 test build for Flint (only Beryl AX), I'm hoping they prioritise a 4.8 build for Flint (version 1) ASAP since such features need to be tested with a device that has multiple network ports, Beryl AX has 2 so can't give any useful testing feedback for gl.inet...